Freezing point of the moisture on the
pavement sensor based upon the specific chemical in use. This field
is reported when the surface status is Wet, Chemical Wet, or
Snow/Ice Warning. Only reported by the FP2000 and active sensors.

Percent of ice in the moisture. When ice
percentage is roughly 50% to 85%, you would typically call the
surface moisture "slush". This field is reported when the
surface status is Wet, Chemical Wet, or Snow/Ice Warning. Only
reported by the FP2000 sensor.

Depth of water layer on the sensor. This
field is reported when the surface status is Wet, Chemical Wet, or
Snow/Ice Warning and the surface temperature is above the freeze
point temperature. Only reported by the FP2000 sensor.

Salinity is roughly the number of grams of dissolved matter per kilogram of seawater.
Units shown in parts per 100,000. This value is only displayed for NTCIP sites configured
with the appropriate sensor.

The following surface status codes are listed in
order of severity with the most critical status listed first.
Third party vendors may calculate surface conditions differently.
Please contact your equipment vendor for details.

Continuous film of ice and water mixture at or below
freezing (32°F / 0°C) with insufficient chemical to
keep the mixture from freezing.
This status can only be reported at SSI ESP and SP sites when
precipitation occurs.

Moisture on pavement at or below freezing (32°F /
0°C) with a pavement temperature at or below the dew
point temperature.
This status can only be reported by SSI ESP, SP, and NTCIP
sites when precipitation is not occurring.

Continuous film of water and ice mixture at or below
freezing (32°F or 0°C) with enough chemical to keep the
mixture from freezing.
This status can only be reported by SSI ESP, SP, and NTCIP sites when
precipitation occurs.

Continuous film of moisture on the pavement sensor
with a surface temperature above freezing (32°F or
0°C).
This status can be reported by SSI ESP, SP, SCAN Detector, and NTCIP
sites when precipitation has occurred.

Thin or spotty film of moisture above freezing (32°F or 0°C).
Surface moisture occurred without precipitation being detected.
This status will only be reported at NTCIP sites when
precipitation is not occurring.

Temperature at which the air becomes saturated as it cools. If the road or runway temperature drops to or
below the dew point, moisture may develop on the surface. The form the moisture takes depends on the
surface temperature and the amount of chemical present.

Average wind direction during an evaluation cycle.
Wind direction can be displayed in
two formats: cardinal points or degrees. Cardinal format
has 8 possible headings. Degree format displays wind
direction in values ranging from 1 to 360.

Type of precipitation detected by a precipitation sensor, if one is available.
Certain types of precipitation sensors can only detect the presence or absence of
precipitation and will display Yes or No. Other types of
precipitation sensors, such as the Weather Identifier and Visibility
Sensor (WIVIS) or Optical Weather Identifier (OWI), can classify the
type of precipitation and will report a specific type of
precipitation. The WIVIS and OWI precipitation sensors may report
Yes at the onset of precipitation until sufficient time has elapsed
to classify the precipitation type.

Rainfall amount or snowfall liquid equivalent for the period from midnight
GMT to the current time. At midnight GMT the total accumulation is reset to zero.
See the accumulation definitions below for the proper NTCIP accumulation definitions.

The wet bulb temperature is the temperature of a thermometer whose bulb is wrapped in wet
muslin. The wetbulb is always in between the temperature and dew point, except at
saturation, when all three are equivalent. This value is only displayed for NTCIP sites
configured with the appropriate sensor.

The amount of chemical that has leaked (as reported by the flow sensor) since the completion of the last spray event.
This counter will reset after each firing and when the sprayer or RPU is restarted.
This value is only reported by a bridge sprayer connected via a Bridge Sprayer Controller.

Feedback status from the bridge sprayer indicates the sprayer is
currently applying chemical. This status will be reported after each activation status listed below
or if the sprayer has been activated from an external source.
The sprayer must provide activation feedback to report this status.

Waiting for confirmation to spray

Before a request for sprayer activation occurs, the RPU must detect conditions that meet
one of the automatic sprayer activation definitions for two consecutive sensor evaluation cycles. This status
will be reported when the RPU initially detects the conditions. Once the conditions are confirmed, the RPU will
request the sprayer is activated and the proper activation status will be displayed.

Spraying Completed

The bridge sprayer has completed a spraying cycle. This status will be reported
upon completion of each sprayer activation. The sprayer must provide activation feedback to report
this status.

Active due to manual user request

A user manually requested a sprayer activation. Manual requests can be initiated
from the SCAN Web Bridge Sprayer Activation page or directly from maintenance mode at the site.

Active due to freeze point condition

The RPU initiated a sprayer activation because the surface temperature is within
the user specified temperature range or is less than the freeze point temperature. A negative value can
be specified to delay the automatic activation of the sprayer.
This status will only occur when the user specified average wind speed threshold has not been exceeded,
the current surface temperature falls within the user defined operating surface temperature range,
and the user defined freeze point condition hold off time has expired.

Active due to frost condition

The RPU initiated a sprayer activation because the surface temperature is
within the user specified temperature range or is less than the dew point. A negative value can be specified
to delay the automatic activation of the sprayer. This status will only occur when the user specified average
wind speed threshold has not been exceeded, the current surface temperature falls within the user defined
operating surface temperature range, and the user defined frost condition hold off time has expired.

Active due to rain and wet surface conditions

The RPU initiated a sprayer activation because the surface temperature is within
the user specified temperature range or is less than freezing and rain is occurring. Moisture must
also be present on the pavement. A negative value can be specified to delay the automatic activation of the sprayer.
This status will only occur when the user specified average wind speed threshold has not been exceeded, the current
surface temperature falls within the user defined operating surface temperature range, the user defined precipitation
condition hold off time has expired, and the automatic precipitation activation option has been enabled.

Active due to freezing rain condition

The RPU initiated a sprayer activation because the surface temperature is within
the user specified temperature range or is less than freezing and freezing rain is occurring. Moisture must
also be present on the pavement. A negative value can be specified to delay the automatic activation of the sprayer.
This status will only occur when the user specified average wind speed threshold has not been exceeded, the current
surface temperature falls within the user defined operating surface temperature range, the user defined precipitation
condition hold off time has expired, and the automatic precipitation activation option has been enabled.

Active due to snow condition

The RPU initiated a sprayer activation because the surface temperature is within
the user specified temperature range or is less than freezing and snow is occurring at a rate greater than .2"/hr (5mm/hr).
A negative value can be specified to delay the automatic activation of the sprayer.
This status will only occur when the user specified average wind speed threshold has not been exceeded, the current
surface temperature falls within the user defined operating surface temperature range, the user defined precipitation
condition hold off time has expired, and the automatic precipitation activation option has been enabled.

Inactive due to high surface temperature

The RPU will not initiate a sprayer activation because the current surface temperature
is warmer than the user defined surface temperature operating range.

Inactive due to low surface temperature

The RPU will not initiate a sprayer activation because the current surface temperature
is colder than the user defined surface temperature operating range.

Inactive due to high winds

The RPU will not initiate a sprayer activation because the average wind speed is exceeding
the user defined maximum wind speed.

Inactive due to freeze point hold off time

The RPU will not initiate a sprayer activation because the user specified freeze condition
hold off time has not yet expired.

Inactive due to frost hold off time

The RPU will not initiate a sprayer activation because the user specified frost condition
hold off time has not yet expired.

Inactive - critical conditions not detected

The RPU will not initiate a sprayer activation because the user specified freeze
and frost conditions are not being reported.

Sprayer currently disabled per user request

The bridge sprayer has been disabled and cannot be automatically activated or manually
activated on-demand until the sprayer is enabled.

The sprayer was triggered by the RWIS; however,
the sprayer did not respond.

An activation request was sent to the bridge sprayer; however, the bridge sprayer
was not activated.

Mode identifies the control mode the site is using to control the generic device.
Supported modes are "Automatic" and "Manual". "Other" will be reported during the site restart process.
Mode is only supported on NTCIP sites.

Device Status displays whether the generic device is either "On" or "Off",
experiencing an "Error" condition, or in a transitional "Pending" state. "Other" will be reported during
the site restart process. These status codes are only available on NTCIP sites.

Describes the configuration of the traffic sensor. The EIS RTMS traffic sensor supports three modes:
Side-fired, Forward-fired In, Forward-fired Out. A permanent count station only supports the In Lane mode.

Side-fired is configured to shoot across traffic lanes and can be configured to monitor up to
eight different traffic lanes.

Forward-fired In is configured to monitor a single traffic lane where traffic is traveling
toward the sensor.

Forward-fired Out is configured to monitor a single traffic lane where traffic is traveling away from the sensor.

Number of large vehicles (such as eighteen wheel trucks) that were detected passing through a traffic zone.
This value is only available in a side-fired configuration. A Side-fired configuration can only be configured
to support Long Volume or Average Headway, but not both.

A time standard which uses the local time of Greenwich,
England known as Greenwich Mean Time. It is one of the time standards used in
meteorology, and it is 4 hours ahead of EDT (5 hours ahead of EST) - 00:GMT is
equal to 8 pm EDT (5 pm PDT), 12:GMT is 8 am EDT (5 am PDT). You might also see
GMT listed as Z, Zulu time, or UTC, Universal Coordinated Time.